[linux.git] / fs / autofs4 / inode.c

/* -*- c -*- --------------------------------------------------------------- *
 *
 * linux/fs/autofs/inode.c
 *
 *  Copyright 1997-1998 Transmeta Corporation -- All Rights Reserved
 *  Copyright 2005-2006 Ian Kent <[email protected]>
 *
 * This file is part of the Linux kernel and is made available under
 * the terms of the GNU General Public License, version 2, or at your
 * option, any later version, incorporated herein by reference.
 *
 * ------------------------------------------------------------------------- */

#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/file.h>
#include <linux/seq_file.h>
#include <linux/pagemap.h>
#include <linux/parser.h>
#include <linux/bitops.h>
#include <linux/magic.h>
#include "autofs_i.h"
#include <linux/module.h>

struct autofs_info *autofs4_new_ino(struct autofs_sb_info *sbi)
{
	struct autofs_info *ino = kzalloc(sizeof(*ino), GFP_KERNEL);
	if (ino) {
		INIT_LIST_HEAD(&ino->active);
		INIT_LIST_HEAD(&ino->expiring);
		ino->last_used = jiffies;
		ino->sbi = sbi;
	}
	return ino;
}

void autofs4_clean_ino(struct autofs_info *ino)
{
	ino->uid = GLOBAL_ROOT_UID;
	ino->gid = GLOBAL_ROOT_GID;
	ino->last_used = jiffies;
}

void autofs4_free_ino(struct autofs_info *ino)
{
	kfree(ino);
}

void autofs4_kill_sb(struct super_block *sb)
{
	struct autofs_sb_info *sbi = autofs4_sbi(sb);

	/*
	 * In the event of a failure in get_sb_nodev the superblock
	 * info is not present so nothing else has been setup, so
	 * just call kill_anon_super when we are called from
	 * deactivate_super.
	 */
	if (sbi) /* Free wait queues, close pipe */
		autofs4_catatonic_mode(sbi);

	DPRINTK("shutting down");
	kill_litter_super(sb);
	if (sbi)
		kfree_rcu(sbi, rcu);
}

static int autofs4_show_options(struct seq_file *m, struct dentry *root)
{
	struct autofs_sb_info *sbi = autofs4_sbi(root->d_sb);
	struct inode *root_inode = root->d_sb->s_root->d_inode;

	if (!sbi)
		return 0;

	seq_printf(m, ",fd=%d", sbi->pipefd);
	if (!uid_eq(root_inode->i_uid, GLOBAL_ROOT_UID))
		seq_printf(m, ",uid=%u",
			from_kuid_munged(&init_user_ns, root_inode->i_uid));
	if (!gid_eq(root_inode->i_gid, GLOBAL_ROOT_GID))
		seq_printf(m, ",gid=%u",
			from_kgid_munged(&init_user_ns, root_inode->i_gid));
	seq_printf(m, ",pgrp=%d", sbi->oz_pgrp);
	seq_printf(m, ",timeout=%lu", sbi->exp_timeout/HZ);
	seq_printf(m, ",minproto=%d", sbi->min_proto);
	seq_printf(m, ",maxproto=%d", sbi->max_proto);

	if (autofs_type_offset(sbi->type))
		seq_printf(m, ",offset");
	else if (autofs_type_direct(sbi->type))
		seq_printf(m, ",direct");
	else
		seq_printf(m, ",indirect");

	return 0;
}

static void autofs4_evict_inode(struct inode *inode)
{
	clear_inode(inode);
	kfree(inode->i_private);
}

static const struct super_operations autofs4_sops = {
	.statfs		= simple_statfs,
	.show_options	= autofs4_show_options,
	.evict_inode	= autofs4_evict_inode,
};

enum {Opt_err, Opt_fd, Opt_uid, Opt_gid, Opt_pgrp, Opt_minproto, Opt_maxproto,
	Opt_indirect, Opt_direct, Opt_offset};

static const match_table_t tokens = {
	{Opt_fd, "fd=%u"},
	{Opt_uid, "uid=%u"},
	{Opt_gid, "gid=%u"},
	{Opt_pgrp, "pgrp=%u"},
	{Opt_minproto, "minproto=%u"},
	{Opt_maxproto, "maxproto=%u"},
	{Opt_indirect, "indirect"},
	{Opt_direct, "direct"},
	{Opt_offset, "offset"},
	{Opt_err, NULL}
};

static int parse_options(char *options, int *pipefd, kuid_t *uid, kgid_t *gid,
		pid_t *pgrp, unsigned int *type, int *minproto, int *maxproto)
{
	char *p;
	substring_t args[MAX_OPT_ARGS];
	int option;

	*uid = current_uid();
	*gid = current_gid();
	*pgrp = task_pgrp_nr(current);

	*minproto = AUTOFS_MIN_PROTO_VERSION;
	*maxproto = AUTOFS_MAX_PROTO_VERSION;

	*pipefd = -1;

	if (!options)
		return 1;

	while ((p = strsep(&options, ",")) != NULL) {
		int token;
		if (!*p)
			continue;

		token = match_token(p, tokens, args);
		switch (token) {
		case Opt_fd:
			if (match_int(args, pipefd))
				return 1;
			break;
		case Opt_uid:
			if (match_int(args, &option))
				return 1;
			*uid = make_kuid(current_user_ns(), option);
			if (!uid_valid(*uid))
				return 1;
			break;
		case Opt_gid:
			if (match_int(args, &option))
				return 1;
			*gid = make_kgid(current_user_ns(), option);
			if (!gid_valid(*gid))
				return 1;
			break;
		case Opt_pgrp:
			if (match_int(args, &option))
				return 1;
			*pgrp = option;
			break;
		case Opt_minproto:
			if (match_int(args, &option))
				return 1;
			*minproto = option;
			break;
		case Opt_maxproto:
			if (match_int(args, &option))
				return 1;
			*maxproto = option;
			break;
		case Opt_indirect:
			set_autofs_type_indirect(type);
			break;
		case Opt_direct:
			set_autofs_type_direct(type);
			break;
		case Opt_offset:
			set_autofs_type_offset(type);
			break;
		default:
			return 1;
		}
	}
	return (*pipefd < 0);
}

int autofs4_fill_super(struct super_block *s, void *data, int silent)
{
	struct inode * root_inode;
	struct dentry * root;
	struct file * pipe;
	int pipefd;
	struct autofs_sb_info *sbi;
	struct autofs_info *ino;

	sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
	if (!sbi)
		goto fail_unlock;
	DPRINTK("starting up, sbi = %p",sbi);

	s->s_fs_info = sbi;
	sbi->magic = AUTOFS_SBI_MAGIC;
	sbi->pipefd = -1;
	sbi->pipe = NULL;
	sbi->catatonic = 1;
	sbi->exp_timeout = 0;
	sbi->oz_pgrp = task_pgrp_nr(current);
	sbi->sb = s;
	sbi->version = 0;
	sbi->sub_version = 0;
	set_autofs_type_indirect(&sbi->type);
	sbi->min_proto = 0;
	sbi->max_proto = 0;
	mutex_init(&sbi->wq_mutex);
	mutex_init(&sbi->pipe_mutex);
	spin_lock_init(&sbi->fs_lock);
	sbi->queues = NULL;
	spin_lock_init(&sbi->lookup_lock);
	INIT_LIST_HEAD(&sbi->active_list);
	INIT_LIST_HEAD(&sbi->expiring_list);
	s->s_blocksize = 1024;
	s->s_blocksize_bits = 10;
	s->s_magic = AUTOFS_SUPER_MAGIC;
	s->s_op = &autofs4_sops;
	s->s_d_op = &autofs4_dentry_operations;
	s->s_time_gran = 1;

	/*
	 * Get the root inode and dentry, but defer checking for errors.
	 */
	ino = autofs4_new_ino(sbi);
	if (!ino)
		goto fail_free;
	root_inode = autofs4_get_inode(s, S_IFDIR | 0755);
	root = d_make_root(root_inode);
	if (!root)
		goto fail_ino;
	pipe = NULL;

	root->d_fsdata = ino;

	/* Can this call block? */
	if (parse_options(data, &pipefd, &root_inode->i_uid, &root_inode->i_gid,
				&sbi->oz_pgrp, &sbi->type, &sbi->min_proto,
				&sbi->max_proto)) {
		printk("autofs: called with bogus options\n");
		goto fail_dput;
	}

	if (autofs_type_trigger(sbi->type))
		__managed_dentry_set_managed(root);

	root_inode->i_fop = &autofs4_root_operations;
	root_inode->i_op = &autofs4_dir_inode_operations;

	/* Couldn't this be tested earlier? */
	if (sbi->max_proto < AUTOFS_MIN_PROTO_VERSION ||
	    sbi->min_proto > AUTOFS_MAX_PROTO_VERSION) {
		printk("autofs: kernel does not match daemon version "
		       "daemon (%d, %d) kernel (%d, %d)\n",
			sbi->min_proto, sbi->max_proto,
			AUTOFS_MIN_PROTO_VERSION, AUTOFS_MAX_PROTO_VERSION);
		goto fail_dput;
	}

	/* Establish highest kernel protocol version */
	if (sbi->max_proto > AUTOFS_MAX_PROTO_VERSION)
		sbi->version = AUTOFS_MAX_PROTO_VERSION;
	else
		sbi->version = sbi->max_proto;
	sbi->sub_version = AUTOFS_PROTO_SUBVERSION;

	DPRINTK("pipe fd = %d, pgrp = %u", pipefd, sbi->oz_pgrp);
	pipe = fget(pipefd);
	
	if (!pipe) {
		printk("autofs: could not open pipe file descriptor\n");
		goto fail_dput;
	}
	if (autofs_prepare_pipe(pipe) < 0)
		goto fail_fput;
	sbi->pipe = pipe;
	sbi->pipefd = pipefd;
	sbi->catatonic = 0;

	/*
	 * Success! Install the root dentry now to indicate completion.
	 */
	s->s_root = root;
	return 0;
	
	/*
	 * Failure ... clean up.
	 */
fail_fput:
	printk("autofs: pipe file descriptor does not contain proper ops\n");
	fput(pipe);
	/* fall through */
fail_dput:
	dput(root);
	goto fail_free;
fail_ino:
	kfree(ino);
fail_free:
	kfree(sbi);
	s->s_fs_info = NULL;
fail_unlock:
	return -EINVAL;
}

struct inode *autofs4_get_inode(struct super_block *sb, umode_t mode)
{
	struct inode *inode = new_inode(sb);

	if (inode == NULL)
		return NULL;

	inode->i_mode = mode;
	if (sb->s_root) {
		inode->i_uid = sb->s_root->d_inode->i_uid;
		inode->i_gid = sb->s_root->d_inode->i_gid;
	}
	inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
	inode->i_ino = get_next_ino();

	if (S_ISDIR(mode)) {
		set_nlink(inode, 2);
		inode->i_op = &autofs4_dir_inode_operations;
		inode->i_fop = &autofs4_dir_operations;
	} else if (S_ISLNK(mode)) {
		inode->i_op = &autofs4_symlink_inode_operations;
	}

	return inode;
}
Commit	Line	Data
1da177e4 LT	1	/* -- c -- --------------------------------------------------------------- *
	2	*
	3	* linux/fs/autofs/inode.c
	4	*
	5	* Copyright 1997-1998 Transmeta Corporation -- All Rights Reserved
34ca959c	6	* Copyright 2005-2006 Ian Kent <[email protected]>
1da177e4 LT	7	*
	8	* This file is part of the Linux kernel and is made available under
	9	* the terms of the GNU General Public License, version 2, or at your
	10	* option, any later version, incorporated herein by reference.
	11	*
	12	* ------------------------------------------------------------------------- */
	13
	14	#include <linux/kernel.h>
	15	#include <linux/slab.h>
	16	#include <linux/file.h>
d7c4a5f1	17	#include <linux/seq_file.h>
1da177e4 LT	18	#include <linux/pagemap.h>
	19	#include <linux/parser.h>
	20	#include <linux/bitops.h>
e18fa700	21	#include <linux/magic.h>
1da177e4 LT	22	#include "autofs_i.h"
	23	#include <linux/module.h>
	24
26e6c910	25	struct autofs_info autofs4_new_ino(struct autofs_sb_info sbi)
1da177e4	26	{
26e6c910 AV	27	struct autofs_info ino = kzalloc(sizeof(ino), GFP_KERNEL);
26e6c910 AV	28	if (ino) {
25767378 IK	29	INIT_LIST_HEAD(&ino->active);
25767378 IK	30	INIT_LIST_HEAD(&ino->expiring);
26e6c910 AV	31	ino->last_used = jiffies;
26e6c910 AV	32	ino->sbi = sbi;
25767378	33	}
26e6c910 AV	34	return ino;
26e6c910 AV	35	}
f50b6f86	36
26e6c910 AV	37	void autofs4_clean_ino(struct autofs_info *ino)
26e6c910 AV	38	{
45634cd8 EB	39	ino->uid = GLOBAL_ROOT_UID;
45634cd8 EB	40	ino->gid = GLOBAL_ROOT_GID;
1da177e4	41	ino->last_used = jiffies;
1da177e4 LT	42	}
	43
	44	void autofs4_free_ino(struct autofs_info *ino)
	45	{
1da177e4 LT	46	kfree(ino);
	47	}
	48
6ce31523	49	void autofs4_kill_sb(struct super_block *sb)
1da177e4 LT	50	{
	51	struct autofs_sb_info *sbi = autofs4_sbi(sb);
	52
ba8df43c IK	53	/*
	54	* In the event of a failure in get_sb_nodev the superblock
	55	* info is not present so nothing else has been setup, so
c949d4eb JK	56	* just call kill_anon_super when we are called from
c949d4eb JK	57	* deactivate_super.
ba8df43c	58	*/
baa40671 AV	59	if (sbi) /* Free wait queues, close pipe */
baa40671 AV	60	autofs4_catatonic_mode(sbi);
1da177e4 LT	61
1da177e4 LT	62	DPRINTK("shutting down");
5b7e934d	63	kill_litter_super(sb);
baa40671 AV	64	if (sbi)
baa40671 AV	65	kfree_rcu(sbi, rcu);
1da177e4 LT	66	}
1da177e4 LT	67
34c80b1d	68	static int autofs4_show_options(struct seq_file m, struct dentry root)
d7c4a5f1	69	{
34c80b1d AV	70	struct autofs_sb_info *sbi = autofs4_sbi(root->d_sb);
34c80b1d AV	71	struct inode *root_inode = root->d_sb->s_root->d_inode;
d7c4a5f1 IK	72
	73	if (!sbi)
	74	return 0;
	75
	76	seq_printf(m, ",fd=%d", sbi->pipefd);
45634cd8 EB	77	if (!uid_eq(root_inode->i_uid, GLOBAL_ROOT_UID))
	78	seq_printf(m, ",uid=%u",
	79	from_kuid_munged(&init_user_ns, root_inode->i_uid));
	80	if (!gid_eq(root_inode->i_gid, GLOBAL_ROOT_GID))
	81	seq_printf(m, ",gid=%u",
	82	from_kgid_munged(&init_user_ns, root_inode->i_gid));
d7c4a5f1 IK	83	seq_printf(m, ",pgrp=%d", sbi->oz_pgrp);
	84	seq_printf(m, ",timeout=%lu", sbi->exp_timeout/HZ);
	85	seq_printf(m, ",minproto=%d", sbi->min_proto);
	86	seq_printf(m, ",maxproto=%d", sbi->max_proto);
	87
a92daf6b	88	if (autofs_type_offset(sbi->type))
34ca959c	89	seq_printf(m, ",offset");
a92daf6b	90	else if (autofs_type_direct(sbi->type))
34ca959c IK	91	seq_printf(m, ",direct");
	92	else
	93	seq_printf(m, ",indirect");
	94
d7c4a5f1 IK	95	return 0;
	96	}
	97
292c5ee8 AV	98	static void autofs4_evict_inode(struct inode *inode)
292c5ee8 AV	99	{
dbd5768f	100	clear_inode(inode);
292c5ee8 AV	101	kfree(inode->i_private);
	102	}
	103
ee9b6d61	104	static const struct super_operations autofs4_sops = {
1da177e4	105	.statfs = simple_statfs,
d7c4a5f1	106	.show_options = autofs4_show_options,
292c5ee8	107	.evict_inode = autofs4_evict_inode,
1da177e4 LT	108	};
1da177e4 LT	109
34ca959c IK	110	enum {Opt_err, Opt_fd, Opt_uid, Opt_gid, Opt_pgrp, Opt_minproto, Opt_maxproto,
34ca959c IK	111	Opt_indirect, Opt_direct, Opt_offset};
1da177e4	112
a447c093	113	static const match_table_t tokens = {
1da177e4 LT	114	{Opt_fd, "fd=%u"},
	115	{Opt_uid, "uid=%u"},
	116	{Opt_gid, "gid=%u"},
	117	{Opt_pgrp, "pgrp=%u"},
	118	{Opt_minproto, "minproto=%u"},
	119	{Opt_maxproto, "maxproto=%u"},
34ca959c IK	120	{Opt_indirect, "indirect"},
	121	{Opt_direct, "direct"},
	122	{Opt_offset, "offset"},
1da177e4 LT	123	{Opt_err, NULL}
	124	};
	125
45634cd8	126	static int parse_options(char options, int pipefd, kuid_t uid, kgid_t gid,
d78e53c8	127	pid_t pgrp, unsigned int type, int minproto, int maxproto)
1da177e4 LT	128	{
	129	char *p;
	130	substring_t args[MAX_OPT_ARGS];
	131	int option;
	132
0eb790e3 DH	133	*uid = current_uid();
0eb790e3 DH	134	*gid = current_gid();
a47afb0f	135	*pgrp = task_pgrp_nr(current);
1da177e4 LT	136
	137	*minproto = AUTOFS_MIN_PROTO_VERSION;
	138	*maxproto = AUTOFS_MAX_PROTO_VERSION;
	139
	140	*pipefd = -1;
	141
	142	if (!options)
	143	return 1;
	144
	145	while ((p = strsep(&options, ",")) != NULL) {
	146	int token;
	147	if (!*p)
	148	continue;
	149
	150	token = match_token(p, tokens, args);
	151	switch (token) {
	152	case Opt_fd:
	153	if (match_int(args, pipefd))
	154	return 1;
	155	break;
	156	case Opt_uid:
	157	if (match_int(args, &option))
	158	return 1;
45634cd8 EB	159	*uid = make_kuid(current_user_ns(), option);
	160	if (!uid_valid(*uid))
	161	return 1;
1da177e4 LT	162	break;
	163	case Opt_gid:
	164	if (match_int(args, &option))
	165	return 1;
45634cd8 EB	166	*gid = make_kgid(current_user_ns(), option);
	167	if (!gid_valid(*gid))
	168	return 1;
1da177e4 LT	169	break;
	170	case Opt_pgrp:
	171	if (match_int(args, &option))
	172	return 1;
	173	*pgrp = option;
	174	break;
	175	case Opt_minproto:
	176	if (match_int(args, &option))
	177	return 1;
	178	*minproto = option;
	179	break;
	180	case Opt_maxproto:
	181	if (match_int(args, &option))
	182	return 1;
	183	*maxproto = option;
	184	break;
34ca959c	185	case Opt_indirect:
a92daf6b	186	set_autofs_type_indirect(type);
34ca959c IK	187	break;
34ca959c IK	188	case Opt_direct:
a92daf6b	189	set_autofs_type_direct(type);
34ca959c IK	190	break;
34ca959c IK	191	case Opt_offset:
a92daf6b	192	set_autofs_type_offset(type);
34ca959c	193	break;
1da177e4 LT	194	default:
	195	return 1;
	196	}
	197	}
	198	return (*pipefd < 0);
	199	}
	200
1da177e4 LT	201	int autofs4_fill_super(struct super_block s, void data, int silent)
	202	{
	203	struct inode * root_inode;
	204	struct dentry * root;
	205	struct file * pipe;
	206	int pipefd;
	207	struct autofs_sb_info *sbi;
	208	struct autofs_info *ino;
1da177e4	209
b63d50c4	210	sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
d78e53c8	211	if (!sbi)
1da177e4 LT	212	goto fail_unlock;
	213	DPRINTK("starting up, sbi = %p",sbi);
	214
1da177e4 LT	215	s->s_fs_info = sbi;
1da177e4 LT	216	sbi->magic = AUTOFS_SBI_MAGIC;
d7c4a5f1	217	sbi->pipefd = -1;
ba8df43c IK	218	sbi->pipe = NULL;
ba8df43c IK	219	sbi->catatonic = 1;
1da177e4	220	sbi->exp_timeout = 0;
a47afb0f	221	sbi->oz_pgrp = task_pgrp_nr(current);
1da177e4 LT	222	sbi->sb = s;
	223	sbi->version = 0;
	224	sbi->sub_version = 0;
a92daf6b	225	set_autofs_type_indirect(&sbi->type);
d7c4a5f1 IK	226	sbi->min_proto = 0;
d7c4a5f1 IK	227	sbi->max_proto = 0;
1d5599e3	228	mutex_init(&sbi->wq_mutex);
d668dc56	229	mutex_init(&sbi->pipe_mutex);
3a9720ce	230	spin_lock_init(&sbi->fs_lock);
1da177e4	231	sbi->queues = NULL;
5f6f4f28	232	spin_lock_init(&sbi->lookup_lock);
25767378	233	INIT_LIST_HEAD(&sbi->active_list);
5f6f4f28	234	INIT_LIST_HEAD(&sbi->expiring_list);
1da177e4 LT	235	s->s_blocksize = 1024;
	236	s->s_blocksize_bits = 10;
	237	s->s_magic = AUTOFS_SUPER_MAGIC;
	238	s->s_op = &autofs4_sops;
b650c858	239	s->s_d_op = &autofs4_dentry_operations;
1da177e4 LT	240	s->s_time_gran = 1;
	241
	242	/*
	243	* Get the root inode and dentry, but defer checking for errors.
	244	*/
26e6c910	245	ino = autofs4_new_ino(sbi);
1da177e4 LT	246	if (!ino)
1da177e4 LT	247	goto fail_free;
726a5e06	248	root_inode = autofs4_get_inode(s, S_IFDIR \| 0755);
48fde701	249	root = d_make_root(root_inode);
1da177e4	250	if (!root)
48fde701	251	goto fail_ino;
34ca959c IK	252	pipe = NULL;
34ca959c IK	253
34ca959c	254	root->d_fsdata = ino;
1da177e4 LT	255
1da177e4 LT	256	/* Can this call block? */
d78e53c8 SB	257	if (parse_options(data, &pipefd, &root_inode->i_uid, &root_inode->i_gid,
	258	&sbi->oz_pgrp, &sbi->type, &sbi->min_proto,
	259	&sbi->max_proto)) {
1da177e4 LT	260	printk("autofs: called with bogus options\n");
	261	goto fail_dput;
	262	}
	263
b650c858	264	if (autofs_type_trigger(sbi->type))
b5b80177	265	__managed_dentry_set_managed(root);
10584211	266
34ca959c	267	root_inode->i_fop = &autofs4_root_operations;
e61da20a	268	root_inode->i_op = &autofs4_dir_inode_operations;
34ca959c	269
1da177e4	270	/* Couldn't this be tested earlier? */
d7c4a5f1 IK	271	if (sbi->max_proto < AUTOFS_MIN_PROTO_VERSION \|\|
d7c4a5f1 IK	272	sbi->min_proto > AUTOFS_MAX_PROTO_VERSION) {
1da177e4 LT	273	printk("autofs: kernel does not match daemon version "
1da177e4 LT	274	"daemon (%d, %d) kernel (%d, %d)\n",
d7c4a5f1	275	sbi->min_proto, sbi->max_proto,
1da177e4 LT	276	AUTOFS_MIN_PROTO_VERSION, AUTOFS_MAX_PROTO_VERSION);
	277	goto fail_dput;
	278	}
	279
d7c4a5f1 IK	280	/* Establish highest kernel protocol version */
	281	if (sbi->max_proto > AUTOFS_MAX_PROTO_VERSION)
	282	sbi->version = AUTOFS_MAX_PROTO_VERSION;
	283	else
	284	sbi->version = sbi->max_proto;
1da177e4 LT	285	sbi->sub_version = AUTOFS_PROTO_SUBVERSION;
	286
	287	DPRINTK("pipe fd = %d, pgrp = %u", pipefd, sbi->oz_pgrp);
	288	pipe = fget(pipefd);
	289
d78e53c8	290	if (!pipe) {
1da177e4 LT	291	printk("autofs: could not open pipe file descriptor\n");
	292	goto fail_dput;
	293	}
64f371bc	294	if (autofs_prepare_pipe(pipe) < 0)
1da177e4 LT	295	goto fail_fput;
1da177e4 LT	296	sbi->pipe = pipe;
d7c4a5f1	297	sbi->pipefd = pipefd;
ba8df43c	298	sbi->catatonic = 0;
1da177e4 LT	299
	300	/*
	301	* Success! Install the root dentry now to indicate completion.
	302	*/
	303	s->s_root = root;
	304	return 0;
	305
	306	/*
	307	* Failure ... clean up.
	308	*/
	309	fail_fput:
	310	printk("autofs: pipe file descriptor does not contain proper ops\n");
	311	fput(pipe);
	312	/* fall through */
	313	fail_dput:
	314	dput(root);
	315	goto fail_free;
34ca959c IK	316	fail_ino:
34ca959c IK	317	kfree(ino);
1da177e4 LT	318	fail_free:
1da177e4 LT	319	kfree(sbi);
ba8df43c	320	s->s_fs_info = NULL;
1da177e4 LT	321	fail_unlock:
	322	return -EINVAL;
	323	}
	324
030a8ba4	325	struct inode autofs4_get_inode(struct super_block sb, umode_t mode)
1da177e4 LT	326	{
	327	struct inode *inode = new_inode(sb);
	328
	329	if (inode == NULL)
	330	return NULL;
	331
09f12c03	332	inode->i_mode = mode;
1da177e4 LT	333	if (sb->s_root) {
	334	inode->i_uid = sb->s_root->d_inode->i_uid;
	335	inode->i_gid = sb->s_root->d_inode->i_gid;
1da177e4	336	}
1da177e4	337	inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
85fe4025	338	inode->i_ino = get_next_ino();
1da177e4	339
09f12c03	340	if (S_ISDIR(mode)) {
bfe86848	341	set_nlink(inode, 2);
1da177e4 LT	342	inode->i_op = &autofs4_dir_inode_operations;
1da177e4 LT	343	inode->i_fop = &autofs4_dir_operations;
09f12c03	344	} else if (S_ISLNK(mode)) {
1da177e4 LT	345	inode->i_op = &autofs4_symlink_inode_operations;
	346	}
	347
	348	return inode;
	349	}